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en.wikipedia.org/wiki/Chemical_reaction

Oxidation is better defined as an increase in oxidation state, and reduction as a decrease in oxidation state. In practice, the transfer of electrons will always change the oxidation state, but there are many reactions that are classed as " redox" even though no electron transfer occurs (such as those involving covalent bonds).

www.merriam-webster.com/dictionary/chemical%20reaction

Define chemical reaction: a chemical change that occurs when two or more substances combine to form a new substance.

www.dictionary.com/browse/chemical-reaction

Chemical reaction definition, Chemistry. reaction (def 7). See more.

www.britannica.com/science/chemical-reaction

chemical reaction: A process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds....

www.businessdictionary.com/definition/chemical-reaction.html

Definition of chemical reaction: Interaction of two or more chemicals that produces one or more new chemical compounds, or alters the properties of the mixed chemicals. Most reactions require heat, pressure, radiation, other ...

www.thoughtco.com/chemical-reaction-definition-606755

Apr 25, 2017 ... This is the definition of a chemical reaction with examples of what is and is not a chemical change.

www.thoughtco.com/definition-of-chemical-change-604902

Apr 25, 2017 ... This is the definition of a chemical change as the term is used in chemistry, along with examples of chemical changes.

www.thoughtco.com/definition-of-reaction-604632

Oct 13, 2017 ... This is the definition of a reaction in chemistry along with a list of types of reactions and examples.

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Aug 17, 2015 ... Sometimes molecules look different on the outside, but only their physical appearance has changed. Other times, through chemical reactions,...